JAVA中定義常量的3種方式

標籤：

1、最古老的

 //未處理public static final int PROCESS_STATUS_UNTREATED = 0;//已接收public static final int PROCESS_STATUS_ACCPECTED = 1;//已處理public static final int PROCESS_STATUS_PROCESSED = 2;

2、改進版的

public static final class PROCESS_STATUS{        //未處理        public static final int UNTREATED = 0;        //已接收        public static final int ACCPECTED = 1;        //已處理        public static final int PROCESSED = 2;}

3、枚舉版（好處顯而易見，既可以擷取code又能擷取漢字），以後定義常量採用此方法

public static enum PROCESS_STATUS implements KeyValueEnum{        UNTREATED(0,"未處理"),        ACCPECTED(1,"已接收"),        PROCESSED(2,"已處理");        private Integer code;        private String desc;        private PROCESS_STATUS(Integer key , String value){            this.code = key;            this.desc = value;        }        @Override        public Integer getCode() {            return code;        }        @Override        public String getDesc() {            return desc;        }       }

 調用方式：

//擷取編碼PROCESS_STATUS.UNTREATED.getCode();//擷取描述PROCESS_STATUS.UNTREATED.getDes();

 

JAVA中定義常量的3種方式